Rotary kiln and cooler



May M. VOGEL-JORGENSEN 2,001,227

ROTARY KILN AND COOLER Filed Jan. 31, 1935 RNEYS Patented May 14, 1935 UNITED STATES ROTARY KILN AND COOLER I Mikael Vogel-Jorgensen,

Copenhagen, Smidth & Co., of New Jersey Application January 31, 1935, Serial No.

Frederiksberg, near Denmark, assignor to F. L. New York, N. Y., a corporation In Great Britain February 3, 1934 1 Claim.

The invention relates to rotary kilns and coolers for use in the manufacture of cement and the like and containing chains suspended within the interior to move during the rotation of the kiln 5 or cooler. The chains hitherto used have been of the ordinary type placed on the market for other purposes and intended primarily to carry loads, and their links have actually beenoblong or elliptical in shape because such links give the maximum length of chain for any given amount of chain material. Experience has shown that chains installed in rotary kilns and coolers are exposed to heavy wear with the result that the chain links become worn through Moreover, in kilns for burning raw cement slurry prepared by the wet method the chain links in the kiln zones in which the slurry is dried become clogged up owing to the adhesion of the slurry to the surface of the links, and this may prevent the chains from moving freely as is desired. Finally, chains of the ordinary type hitherto used tend to twist and thus toshorten and form lumps as the kiln or cooler rotates so that the free useful surface area, and thus, in the case of chains installed in rotary. kilns, the capacity of the chain for transmitting heat from the kiln gases to the material are diminished.

According to the present invention chains composed of circular chain links are used, as will be fully explained hereinafter with referfairly quickly. I5

ence to the accompanying drawing, in which the invention is illustrated, and in which:

Fig. 1 shows a vertical section through a rotary kiln, showing one form of suspension of chains and Fig. 2 is a view of a single chain with circular links When the kiln is in motion the points of contact between any two links I change constantly. Due to this constant change the links do not become clogged up owing to material adhering to them, and the tendency for the chains to twist is very much less when circular chain links are used than when chains having ordinary links are used. This will be of particular value if, for instance, the chains are only fixed to the kiln shell in one end, as is the case with the chain 2. Moreover, increased weight and surface area of chain per unit of length are obtained by using circular links instead of using oblong and elliptical links, and the life of the chains is longer because the wear is not localized, as is the case with the ordinary chains hitherto used.

I claim as my invention:

A rotary kiln or cooler for use in the manufacture of cement and the like and containing chains suspended within the interior to move during the rotation of the kiln or cooler, which chains are composed of circular links.

MIKAEL VOGEL-JORGENSEN. 

